A simple model for crack growth in creep resistant alloys

A simple model of creep crack growth, valid for creep-resistant alloys, is described. For such alloys, it may be assumed that the creep deformation is essentially confined to a thin region in the neighborhood of the crack tip . This thin region is modeled as a cohesive zone. Outside the cohesive zone , linear elastic conditions are assumed to prevail. Numerical results for b oth transient and steady-state crack growth are presented. For reasonable c hoices of model parameters, the numerical results show rather good agreemen t with experimental data.